Recent Log Entries

Why We Are Swiping Injector Harps

Log Number: 3825904Logbook(s): Entry Makers: moserBody: 

RF in the main machine struggling due to storms. So can't send out of the Injector. With beam envelopes for each Hall not reproducing yesterday, I wondered if perhaps our input conditions from the Injector have changed.

Exactly one month ago, the Inj 5MeV and Inj-NL matches were done using the A-laser. There are harp traces from back then available to compare against.

We aren't planning on changing anything in the Injector unless our hand is forced. But we have to measure to know.

FSD Masking Tool: Successful System Masking for: BeamLossMonitor

Log Number: 3825899Logbook(s): Tags: Body: System Masking for: BeamLossMonitor
User: eforman
Areas: All

BeamLossMonitor Devices:
ILM0I07
ILM0L01A
ILM0L01B
ILM0L02
ILM2D00A
ILM2D00B
ILM0L04A
ILM0L04B
ILM0L05
ILM0L06A
ILM0L08
ILM0R01
ILM4D00
ILM0R03
ILM0R04
ILM0R06
ILM0R08
ILM0R09
ILM1L01
ILM1L02
ILM6R08
ILM3S00
ILM7S00
ILM9S00
ILM5S10
ILM5E03
ILM7S01
ILM9A01
ILM3E02
ILM5A01
ILM1A04
ILM1A06
ILM3R10
ILM9R07
ILM1R09
ILM2L03
ILM5R10
ILM5R05
ILM2L01
ILM2T09
ILM8T09
ILM4C01
ILM4C02
ILM4C03
ILM1C0

LEM South Linac

Log Number: 3825885Logbook(s): Tags: Body: LEM 9.6 was successfully run for the South Linac on Wed Aug 12 16:44:12 2020. The application phase took 0:02:02 to complete.

LEM South Linac - failure

Log Number: 3825880Logbook(s): Tags: Body: LEM 9.6 was unsuccessfully run for the South Linac on Wed Aug 12 16:33:47 2020. The operation terminated after 0:00:49 with the following results.
Cavity summarySuccess: 199 Abort: 1 Fail: 0

UITF Open

Log Number: 3825878Logbook(s): Entry Makers: poelkerBody: 

Gun HV OFF, booster RF OFF, rad monitor says Safe, valves closed, Cave open

The following cavities have been bypassed: 2L04-7

Log Number: 3825877Logbook(s): Tags: Body: 

The following cavities have been bypassed:
2L04-7
Username: eforman
Date/Time: 08-12-20_16:29:38
RF Status: Good
Tuner Status: Good
Comment: Bypassed - stepped off +100k - KVFM low, trips out of HV permit
Special Instructions:

SL LEM if we lost 2L04-7 -- Bypassing

Log Number: 3825875Logbook(s): Entry Makers: moserBody: 

Rather than spend an hour trying to get it back, bypassing. Trip rate will be ~13/shift, Figure 3. Up from, Figure 4, 11/shift.

2L04-7 KVFM faults

Log Number: 3825874Logbook(s): Entry Makers: eformanBody: 

Filament voltage is unstable & low. Bypassing cavity for now.

Operator SIGN IN

Log Number: 3825872Logbook(s): Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Deir
DATE:             08/12/2020
SHIFT:               Swing

The operator has read the following:
  • ELOG
  • PD Shift Plan
  • Radiation Surveys for PSS Segments in Controlled Access
  • PSS Log

PD UPDATE: stormy weather

Log Number: 3825867Logbook(s): Tags: Entry Makers: beneschBody: 

Four C100s in the NL and five in SL tripped with the thunder as I started writing.

Ops is still working on Compton background for hall A.

B and D have been getting beam after checking that they don't cause background in A.

C has been steered up for Moller measurement, including a 17% reduction in the 20 mm vertical chicane values to reduce vertical offset on diagnostic girder.

2L04 is recovering from a trip as I write; that's a C50. And all the SL C100s just went again.

Where We Are In Between C100s Trips

Log Number: 3825866Logbook(s): Entry Makers: moserBody: 

We've added +6 degrees of bunch compression into 0L04 gang phase. This appears to have greatly reduced Compton background rates in Hall A. They are setup to receive 150uA on Carbon-1% target to further check these.

Hall B and D have reported to adverse effects as a result of the bunch compression.

Hall C is awaiting the start of their Moeller measurement. It is setup and ready for 1uA.

If we can keep RF up, we plan to keep the bunch compression in 0L04 and get Hall A up to high currents, while continuing physics delivery to B and D and beginning the Hall C Moeller measurement.

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